Process and apparatus for applying and removing liquid...

B - Operations – Transporting – 21 – B

Patent

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Details

B21B 45/02 (2006.01) C21D 9/573 (2006.01) C22F 1/04 (2006.01) C21D 1/667 (2006.01)

Patent

CA 2117481

Cooling of metal strip (16) in a single or multistand cold rolling line by applying coolant liquid only to the lower surface of the strip (16), and removing the liquid therefrom, after each, or between successive roll stands (11a, 11b, 11c). The liquid is delivered, at each cooling locality, at low pressure through a plurality of slots (32) each extending transversely beneath and across the full width of the strip (16), the slots (32) being spaced apart along the path of the strip (16) and generally being oriented to discharge the coolant liquid toward the strip lower surface at an angle of greater than 90° to the direction of strip advance. Coolant removal is effected by directing one or more liquid knives (52a, 54a, 60a) against the strip lower surface between the plurality of slots (32) and the next downstream roll stand in the line, at a location at which the strip (16) is trained around a hold-down roll (56).

Refroidissement d'une bande métallique (16) dans un laminoir à froid à une ou plusieurs cages, comportant les étapes suivantes : appliquer un liquide refroidissant uniquement sur la surface inférieure de la bande (16), puis enlever ce liquide après chaque cage ou entre des cages successives (11a, 11b, 11c). Chaque poste de refroidissement est alimenté en liquide sous basse pression au moyen de plusieurs fentes (32), chaque fente se prolongeant transversalement sous la bande (16) sur sa pleine largeur. Les fentes sont espacées sur la longueur de la bande (16) et généralement orientées de manière à diriger le liquide refroidissant sur la surface inférieure de la bande à un angle supérieur à 90 degrés par rapport à la direction de l'avancement de la bande. L'élimination du liquide refroidissant s'effectue en dirigeant une ou plusieurs lames d'eau (52a, 54a, 60a) contre la surface inférieure de la bande entre les fentes (32) et la prochaine cage de laminoir en aval du train de laminoirs, à l'endroit où la bande (16) est roulée autour d'un cylindre de retenue (56).

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